Golf & Tennis elbow share the same cause -- overuse and repetitive stress

The elbow itself is essentially a hinge joint, meaning it bends and straightens like a hinge. But there is a second joint where the end of the radius meets the humerus. This joint is complicated because the radius rotates so that you can turn your hand palm up and palm down. At the same time, it slides against the end of the humerus as the elbow bends and straightens. 

The joint is...

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